I have a merc 150hp 4stroke when I tow this it always seems to crack my transom saver no matter how many new ones I buy. What can I do to help prevent this?

What kind of "Transom Saver" are you using?  Trailer to Lower or those that attach to the motor rams?  

Trailer to lower and the heavy duty one. 

Common problem with Rangers because of the distance to the trailer from the Lower Unit.  The best way to minimize it is to use Steering clips to keep the side to side action to a minimum and make sure your motor is straight and very snug down on the transom saver.  

Motor mate, problem solved. 

Can’t use a motor mate with this motor and it’s cable steering so I’ve heard the clips won’t work

What angle is your motor at when it is on the toter?  You might have to let it set more vertical which reduces your ground clearance but helps keep the motor straight.  

I’ll take some pitctheea today and upload them tonight.

Do you have a solid transom saver or one with a shock absorber?

This is exactly why I moved from transom savers to the MyWedge.

 

Broken transom savers are telling you something: Shocks from the trailer are getting transferred right up that aarm to you lower unit...